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Unrrno STATES PATENT @rrrcn.

JAMES L. DURROUGH, OF HAMILTON, OHIO.

ART OF BRICK-MANUFACTURE.

SPECIFICATION forming part of Letters Patent No. 303,925, dated August19, 1884.

Application filed February 2!, 1894. (No specimens.)

aZZ- whom it may concern:

Be it known that I, J anus L. Dunnonen, of Hamilton, Butler county,Ohio, have invented certain new and useful Improvements in the Art ofBrick-Maiuifacture, of which the following is a specification.

This invention relates to an imp rov ed method of treatment for brickafter they are molded and before they are subjected to the process ofburning in the kiln.

The object of the invention is to more perfectly and rapidly extractfrom the formed bricks the moisture which was in the clay from which thebricks were formed.

The invention consists in subjecting cold moist brick to the directaction of steam undcr pressure confined therewith, and subsequentlysubjecting the brick to the action of dry air, as hereinafter more fullyset forth.

In the execution of my improvement, we will assume that we have at handa strong apartment in which the bricks may be incloscd, the apartmentbeing of sufficient strength to resist an internal pressure, say, offifty pounds per square inch, and being" provided with suitable valvesfor the admission of steam. he bricks in their moist state are to beplaced in this apartment, which may be done by loading the bricks oncars or trucks and running the same into the apartment. The apartmentthen is to be closed steam-tight and steam admitted under pressure. Theresult is that the evap oration particles of moisture in the bricksbecome heated and expanded and fitted for ready \Vhcn the bricks havetheir contained moisture sufficiently heated, a matter which will bedetermined by experience, the pressu re is relieved in the apartment,which is then opened, after which the bricks are run out of theapartment, and the hot moisture allowed to evaporate by the naturalaction of the atmosphere, which action may, if desired, be hastened bythe use of air-blasts. The effect of this process is to cause a thoroughre JAMES L. DURROUGH.

Witnesses:

WV. A. SEWARD, ISRAEL XVrLLLiMs.

